利用化学种子生长法制备了多种长径比的金纳米棒,通过监测不同折射率下金纳米棒的局域表面等离子体共振(LSPR)波长移动来研究其折射率传感的灵敏度.实验结果表明,随着纳米棒长径比增加,其折射率传感的灵敏度近似线性地提高.在监测波长范围内,灵敏度从长径比为2.5∶1时的216 nm/RIU增长至4.2∶1时的352 nm/RIU.对于长径比为4.2∶1的金纳米棒,用离散偶极子近似(DDA)的方法模拟了其折射率传感的灵敏度,与实验结果基本一致.
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